go的结构体与接口学习

package main

import "fmt"

type DATAfile interface {
   Test11() string   //注意这里的返回值   不加string报错
}


type User struct {
   id int
   name string
   age int
   se string
}

func (u User) Test11() string {
   str:=fmt.Sprintf("id=%d
name=%s
age=%d
se=%s
",u.id,u.name,u.age,u.se)
   return str
}


func main() {

   u := User{
      id: 12,
      name: "yunhua",
      age: 37,
      se: "nan",
   }
   f := User{
      id: 34,
      name: "che",
      age: 67,
      se: "nv",
   }
   var D DATAfile
   D=f
   fmt.Println(D.Test11())


   fmt.Println(u.Test11())
   fmt.Println(u.name)

}